Insulator



NOV. 23 1926. 1,608,029 v F. M. LOCKE INSULATOR Filed August 9, 1920 INV NTOR.

Nov. 23, 1926.

Penn" we Fe es or news E Y K- ass sses Application filed August 9, 1320 serial No. 492277,

The present invention relates to insulators and more particularly to thetype known as suspension insulators in which one or more insulating members are suspended from above and have the conductor suspended therefrom, an object of this invention being to provide an insulator which will have an insulating member free from the-strains r stresses of suspension so that it will be subject only to electrical stresses or strains. Another object of-the invention is to provide for connecting the terminals such as the strain pin and the suspending means so that a. maximum electrical distance between these'terminals is obtained. -A still further object of the invention is to connect the terminals toan insulating member insuch a mannerthat-said member is placed-under compression by the strain on the insulator and'not under tension. Another and further object of the invention is to provide an insulator element formed of two insulating 1111l1b1$,0118 of which carries the mechanical strain while the other carries the greatest electrical strain and is substantially free from mechanical strain so that the electrical strain is more evenly distributed over the surface of the insulator than has heretofore been possible, causing less corona effect. A still further'object is to provide an insulator'whic-h is not subject to a high electrical fiashover but will spill over at about its wet fiashover voltage.

To these and other ends-the invention consists of certain 'partsand combinations'of parts, all of which will-be hereinafter described, the novel features being pointed out in the appended claims. 1 In the'drawingsi A.

1 is a plan view of a suspension insulator element constructed in accordance with this invention;

Fig. 2 is a vertical section through the insulator illustrated in Fig. 1;

Fig. 3 shows two of the insulators connected and in side elevation;

Fig. l is a fragmentary sectional view showing another embodiment of the connection between the suspending means and the lower insulator member; and

Fig. is a fragmentary view of the under side of the insulator illustrated in Fig. 4.

According to the illustrated embodiment of the invention each insulator element comprises an insulating member 1 with means for suspending the same in such a manner that the insulating member is substantially free of all the strains and stresses of-suspension. This suspending means in this instance, embodies an insulatingmember 2 on which the member 1 rests'and a suspending device 3,: in this instance. formed fronra single strand of wire or other suitable. material which is lacedthrongh openings 4 in the insulating member 2 adfj a cent. the periphery or thelatter and beyond the periphery of the insulating member l. the strand also being connected with a suitable support such as an=eye 5 formed in the lower end ofa hanger arranged above it or in the lower end of a' strain pin 6 which is connected to the insulating .membeu of the insulating element next above in any suitable manner as that hereinafter described 1 I The insulatingmember 2 may be of substantiallyconvex or cup shaped. form and the insulating member 1 preferably conforms to the upperface of the member 2. The strand'oivsuspended device 3Kpreferably. engages the insulating member .1 at its periphery as at Twand may also engage said insulating member 1 atS at the periphery of the upstanding hollow boss 9 on said me nber 1. This arrangement holds the insulating member 1 centered on thefmember 2. If desired, the space between the members 1 and 2 may be-filled. with. an insulat ing' orothercompound which will reduce the static disch-arge between lillell'l.-..,Al'l

asphalt compound of highK-melting point .may beemployed in this connection inst-ead of using a: single strand or-cable 3 there may be'employed numberof rods 3 anchored at their-upper ends'lin any suitable manner" and havingtheir-lower enGs passed through eyes 8 in anchoring pins 3 which are passed through the openmgs 4 and secured by washers 3" at their lower ends as shown in Eigs. a and 5. In both illustrated forms of the invention the insulating member 2 may have an annular skirt or flange depending therefrom within the openings 4.- so as to increase the insulating surface and arcing distance between the terminals of the insulator formed by the suspending device and the center strain pin.

The strain. pin 6 may be secured to the in sulator in any suitable manner. It is pre ferred however to provide a loose connection between the pin and the insulator and to this end the insulating member 2 is pro vided with a central upstanding pocketed latter extending through the opening 12.

This connection of the strain pin with the insulating member 2 permits the lateral sw1ngmg of the strain pin so that any lateral strain on the insulator relatively to the pin will equalize the strain on the insulator and not tend to crack such insulator.

From the foregoing it will be seen that there has been provided a suspension insu later having an insulating member which is substantially free from the strains and stresses of suspension and takes the principal electrical strain of the insulator. This suspending means preferably embodies another insulating member which takes substantially all of the mechanical strains and stresses of suspension. The mechanical strain on this second mentioned insulating member is in the form of compression and this is obtained by making said insulating member of substantially cup form and connecting the two terminals, one at the center of the member and the other at the periphery of the member. Another advantage of connecting the terminals, one at the center and the other at the periphery of an insulating member is that it is possible to increase the thickness 01" the insulating member so as to secure a greater distance between the terminals of the insulator than when the terminals are both connected substantially at the center. An insulator constructed in accordance with this invention distributes the electrical strain over the surface of the insulator, so that it is not concentrated at the center.

That I claim as my invention and desire to secure by Letters Patent is:

1. A suspension insulator comprising a lower insulating member having a central opening and flaring outwardly and downwardly with reference to its center, its lowr edge being below the central portion through which the opening is provided, a strain pin extending through said central opening, a suspending means connected to said lower insulating member adjacent the edge of the latter and at a point below the central portion through which the opening is provided, so that there is imposed on the lower insulating member compression strains from the suspending means to the strain pin in a direction which is inward and upward, and a second insulating member loosely supported on the lower insulating member, covering the upper end of the strain pin and the opening therethrough and extending downwardh and outwardly over the upper face of the lower insulating member.

2. A suspension insulator comprising a lower insulating member having a central opening and flaring outwardlyand do.

vardly with reference to its center, its lower edge being below the central portion through which the opening is provided, a strain pin extending through said central opening, suspending means connected to said lower insulating member adjacent the edge of the latter and at a point below said central portion through which the opening is provided so that compression strains are imposed on the lower insulating member extending between the suspending means and the strain pin through the flaring portion of the insulator, and a second insulating member having a portion flaring outwardly and downwardly from its central portion covering the upper end of the strain pin and extending downwardly over the upper face o1 the lower insulating member to a point adjacent the suspending means, so that it is entirely free from all mechanical strains, at the same time, insulating the electrical strains betweenthe strain pin and the suspending means.

rnnn in. Locus.

CERTIFICATE OF CORRECTION Patent No. 1,608 O29, granted November 25, 1926.

to FRED M. LOCKE.

It is hereby certified that error appears in the printed. specification of the above mentioned patent requiring correction as follows: Page 2, after line 45, insert "The insulator not subjected to both mechanand electrical at one central point and a heavy lightning discharge will spill. over the outer part of the insulator rather than to put heavy strains through the insulator" and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of February, A. D. 1927.

William A. Kinnan, Seal. Acting Commissioner of Patents.

CERTIFICATE OF CORRECTION.

Patent No. 1,608,029, granted November 25, 1926 to FRED M. LOCI E It is hereby certified that error appears in the printed specification of the above mentioned patent requiring correction as follows: Page 2, after line 45, insert "The insulator is not subjected to both mechanand at one central point and a heavy lightning discharge will spill over the outer part of the insulator rather than to put heavy strains through the insulator" and that the said Letters Patent should be read with this correction therein that the same'may conform to the record of the case in the Patent Office. Signed and sealed this 15th day of February, A. D. 1927.

William A. Kinnan, Seal. Acting Commissioner of Patents. 

